Brake



Aug. 30, 1932. A. Y. DODGE BRAKE Original Filed March 10 Patented Aug. 30, 1932 UNITED STATES PATENT OFFICE.

ADIEL Y. DODGE, OF SOUTH BEND, INDIANA, ASSIGNOR TO IBENDIX BRAKE COMPANY,

OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS A BRAKE Application filed March 10, 1924, SerialN'o. 397,983. Renewed January 21, 1929.

My invention relates 'to brakes.

One of the objects ofmy invention 1s to provide an internal brake construction which is self-energizing to a large extent, and in which nevertheless a substantially uniform pressure and wear is exerted on the brake 11n- 1 further object of my invention is to provide an internal brake which will combine the advantages of the shoe brake and the band brake.

Further objects Will appear mm the description and claims.

In the drawing, in which an embodiment of my invention is shown- I Figure 1 is a side view, partly in section, of an internal brake construction;

Fig. 2 is an axial section; and

Fig. 3 is a detail view showing the interfitting of the brake shoes.

In a general way, the construction comprises two internal brake shoes pivoted at diametrically opposite points and extending in the same circumferential direction and means for exerting a substantially radial pressure on these brake shoes at diametrically opposite points, respectively. Each brake shoe may extend substantially through 180 Referring now to the drawing in detail, the construction shown comprises a brake drum 10, a pair of internal brake shoes 11 and 12, pivoted on pins Band 14, respectively, a curved link 15 pivotall connected at 16 to the brake shoe 11, an a justable link 17 pivotally connected at 18 to the brake shoe 12,

and pivotally connected at 19 to the curved link 15, and means for actuating the llIlkS 15 and 17 to cause them to exert radial pressure at diametrically opposite points on the pivoted shoes 11 and 12. Stop members 20 and 21 are provided on the link 15 and brake shoe 11, respectively, to prevent excessive movement of the links 15 and 17; that is, to prevent the pivotal point 19 from passing the dead center line between the pivotal connections at 16 and 18. A pair of springs 22 and 23 are provided interconnecting the brake shoes 11 and 12 for normally holding the brake shoes away from the brake drum.

The brake shoes are interfitted by a tongue and -notch connection 24,...(Fig. 3), to hold them in alinement with each other.

The means for actuating the links 15 and 17 comprise a rock shaft 25, mounted in bearings 26 and 27 on the axle 28, a rock arm 29 secured to the rock shaft 25, and a link 30 having a ball-joint connection with the rock arm and the links at 31 and 32, respectively. The rock shaft 25 is actuated by the brake pedal (not shown). The pins 13 and 14 011 which the brake shoes are pivotally mounted may be mounted on a plate 33 secured to the steering knuckle 34. A flexible dust-proof connection is made at 35 between the plate 33 and the arm 29. The ball joint connections at 31 is adjacent the axial line BB of the steering knuckle to permit the steering movement of the wheel 36 on which the brake drum 10 is mounted. As shown in Fig. 2, the connection 31 is offset slightly outwardly from the axis BB, so that the braking effect on the outside wheel may be relieved slightly in making a turn.

To secure the greatest braking effect, the brake drum rotates in the direction of the arrow A so that the brake shoes 11 and 12 are self-energizing to a considerable extent as in the case of a band brake; and yet because of the shoe construction, the pressure exerted on the brake drum will be substantially uniform throughout a considerable extent.

The springs 22 and 23 extend diagonally, as

shown in Fig. 3, so as to exert a lateral force.

to hold the contiguous faces snu ly against each other to prevent rattling 0% the interfitting ends of the brake shoes. Thesprings thus not only serve to release the brake shoes but also to prevent rattling.

Having thus described my invention, what I claim'as new and desire to secureby Letters Patent of the United States is j 1. A brake comprising a air of 'anchored shoes, with the free end 0 one shoe overlapping the anchored end of the other shoe.

2. A brake comprising a pair of anchored shoes extending circumferentially inthe same direction from their anchored ends, and overlapping each other at their ends.

3. A stcerable wheel brake construction otally connected with said axle, a steerable its free end overlapping the adjacent end of wheel mounted on saidsteering knuckle, a the other device. .7 1 brake drum mounted on said steerable wheel, 10. A brake comprising a drum, a plurala pair of internal brake shoes acting on said ity of friction devices arranged end to end drum, apair of links pivotally connected totherein, at least one of said friction devices gether and pivotally connected to said brake anchored at one endand being of constantly shoes, respectively, at opposite points, a rock decreasing radial extent from the anchored shaft mounted on said axle, and transmission end toward the free end and having its end from said rock shaft to said links, comprising of least radial extent held in alignment by a rock arm on said rock shaft, and a third the adjacent end of the other device.

link connecting said rock arm with said pair 11. A brake comprising a drum, a pluralof links, the connection of said third link ity of friction devicesarranged therein to with said rock arm lying adjacent the axis of be urged thereagainst, at least one of said the steering knuckle. friction devices being so formed that its ra- 4. An internal brake construction comprisdial extent constantly decreases from one ing a brake drum and a pair of arcuate brake end to" the other and having its end of least shoes bearing on the inner surface of said radial extent arranged in overlapping rela-' drums, pivoted adjacenttheir ends, respectionship with the adjacent end of the suc tively, and extending inwthe same circumw ceeding friction device and interengaged ferential direction from their pivots, the therewith to maintain the alignment, and swinging end of one shoe overlapping the torque taking means associated with said shoe pivoted end ofthe other shoe, said overlapat its end of greatest radial extent.

ping ends being provided with interengaging 12. A brake comprising a drum, a pair of means for holding them in alinement. anchored friction members extending circum- 5. An internal brake construction comprisferentially in the same directionfrom their ing a brake drum, and two anchored brake anchored ends, said friction members toshoes bearing on theinner surface of said get-her extending substantially 360 and tadrum, said brake shoes having overlapping pering gradually from their anchored ends ends provided with interengaging means for toward the other ends, and means for forcholding them in alineme-nt, one of the intering the unanchored end of each-of the fricengaging ends being the unanchored end of tion members against the drum.

its shoe and the other being the anchored end of its shoe. 0

6; An internal brake construction compris- In witness'whereof, I have hereunto subscribed my name.

' A. Y. DODGE.

ing a brake drum, and two brake shoes hearing on the inner surface of said drum, said brake shoes having overlapping ends provided with interengaging means for holding them against lateral displacement With respect to each other in one direction, and a. biasing spring connectingsaid shoes for releasing one of said shoes and pressing one of said shoes laterally a ainst the other to prevent rattling.

7. A bra ke comprising a pair of shoes each anchored at one end and extending circun1 ferentially in the same direction from their anchored ends, each shoe having a free end overlapping the anchored end of the other shoe and interengaged therewith to be held in ali nment thereby.

8. X brake comprising a drum, a pair of shoes each anchored at one end within the drum to be urged thereagainst, each shoe having a free end overlapping and interengaged with the adjacent and anchored end of the other shoe and a spring holding the free end ofeach shoe on a-bias toward the anchored end of the shoe overlapped thereby to prevent rattle.

9. A brake comprising a drum, :1 pair of friction devices anchored within the drum to be urged thereagainst, at least one of said friction devices so formed as to be of gradu ally decreasing radial extent from its anchored end toward itsfree end and having 

